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The Core HTTP Module in Nginx

"Increasing the size of uploaded files: Usually when you are
running a site where the user uploads a lot of files, you will see
that when they upload a file which is more than 1MB in size you get
an Nginx error stating, "Request entity too Large" (413), as shown
in the following screenshot. We will look at how Nginx can be
configured to handle larger uploads.

"How to do it... This is controlled by one simple part of the
Nginx configuration. You can simply paste this in the server part
of the Nginx configuration:

"client_max_body_size 100M; # M stands for megabytes

"This preceding configuration will allow you to upload a 100
megabyte file. Anything more than that, and you will receive a 413.
You can set this to any value which is less than the available disk
space to Nginx, which is primarily because Nginx downloads the file
to a temporary location before forwarding it to the backend
application."